An alternate or archaic spelling of 'desirable'; worthy of desire, attractive, or worth wanting.
This is a non-standard or obsolete spelling variant of 'desirable.' English spelling standardized gradually, and '-able' endings were often spelled '-eable' in Middle and Early Modern English before simplifying.
This misspelling shows how English spelling is still settling! Most of us spell it 'desirable' now, but you'll find 'desireable' in older texts, much like how 'connection' and 'connexion' both exist. Spelling wasn't always a straightforward thing.
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